Validity of <scp>ICD</scp>‐10‐based algorithms to identify patients with influenza in inpatient and outpatient settings

In a large US healthcare system, inpatient ICD-10-CM codes for influenza, particularly primary inpatient diagnoses, had high predictive value for test-positive influenza. Outpatient ICD-10-CM codes were moderately predictive of test-positive influenza.